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SPDC Terms beginning with G
Terms and definitions extracted from current SPDC published documents
Click one of the capital letters above to advance the page to terms beginning with that letter.
Not possessing gaps, series, or parallel as in gapless arrester.
- gas-tube surge arrester (gas-tube surge-protective device component)
A gap, or gaps, in an enclosed discharge medium, other than air at atmospheric pressure, designed to protect apparatus or personnel, or both, from high transient voltages.
An electrode connected to one of the semiconductor regions to introduce a control current.
- gate reverse current, adjacent terminal open
The current through the gate terminal when a specified gate bias voltage, VG, is applied and the cathode terminal for a p-gate device or anode terminal for an n-gate device is open circuited.
- gate reverse current, forward conducting state
The current through the gate terminal when a specified gate bias voltage, VG, is applied and a specified forward conduction current, IF, is flowing.
- gate reverse current, main terminals short-circuited
The current through the gate terminal when a specified gate bias voltage, VG, is applied and the cathode terminal for a p-gate device or anode terminal for an n-gate device is short circuited to the third terminal.
- gate reverse current, on-state
The current through the gate terminal when a specified gate bias voltage, VG, is applied and a specified on-state current, IT, is flowing.
- gate switching charge
The charge through the gate terminal, under impulse conditions, during the transition from the off-state to the switching point, when a specified gate bias voltage, VG, is applied.
- gate-to-adjacent terminal breakover voltage
The gate to cathode voltage for a p-type device or gate to anode voltage for an n-gate device at the breakover point. This is equivalent to the voltage difference between the breakover voltage, V(BO), and the specified gate voltage, VG.
- gate-to-adjacent terminal peak off-state voltage
The maximum gate to cathode voltage for a p-gate device or gate to anode voltage for an n-gate device that may be applied such that a specified off-state current, ID, at a rated off-state voltage, VD, is not exceeded.
- glow current
The current that flows after breakdown when circuit impedance limits the current to a value less than the glow-to-arc transition current. Syn:glow mode current.
- glow voltage
The voltage drop across the gas tube during glow-current flow. It is sometimes called the glow mode voltage.
- glow-to-arc transition current
The current required for the gas tube to pass from the glow mode into the arc mode.
- grading or control ring
A metal part, usually circular or oval in shape, mounted to modify electrostatically the voltage gradient or distribution.
- ground insulation (rotating electric machinery)
Insulation used to insure the electric isolation of the windings from the core and mechanical parts of a machine. It separates the turn insulation from the surrounding slot steel. Ground insulation is sometimes referred to as coil insulation, or groundwall insulation.
- ground potential rise (GPR)
The voltage that a station grounding grid may attain relative to a distant grounding point assumed to be at the potential of remote earth.
- ground terminal
The conducting part provided for connecting the arrester to ground.
- ground-fault factor
The ratio of the highest power frequency voltage on an unfaulted phase during a line-to-ground fault to the phase-to-ground power-frequency voltage without the fault.
NOTE 1 — The ground-fault factor generally will be less than 1.3, if the zero-sequence reactance is less than three times the positive-sequence reactance, and the zero-sequence resistance does not exceed the positive-sequence reactance.
NOTE 2 — IEEE Std C62.1-1989 defines a ?coefficient of grounding.? This coefficient can be obtained by dividing the ground-fault factor by root 3.